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+" Vim syntax file
+"
+" Language: NATURAL
+" Version: 2.1.0.5
+" Maintainer: Marko von Oppen <marko@von-oppen.com>
+" Last Changed: 2012-02-05 18:50:43
+" Support: http://www.von-oppen.com/
+
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
+ finish
+endif
+setlocal iskeyword+=-,*,#,+,_,/
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" NATURAL is case insensitive
+syntax case ignore
+
+" preprocessor
+syn keyword naturalInclude include nextgroup=naturalObjName skipwhite
+
+" define data
+syn keyword naturalKeyword define data end-define
+syn keyword naturalKeyword independent global parameter local redefine view
+syn keyword naturalKeyword const[ant] init initial
+
+" loops
+syn keyword naturalLoop read end-read end-work find end-find histogram end-histogram
+syn keyword naturalLoop end-all sort end-sort sorted descending ascending
+syn keyword naturalRepeat repeat end-repeat while until for step end-for
+syn keyword naturalKeyword in file with field starting from ending at thru by isn where
+syn keyword naturalError on error end-error
+syn keyword naturalKeyword accept reject end-enddata number unique retain as release
+syn keyword naturalKeyword start end-start break end-break physical page top sequence
+syn keyword naturalKeyword end-toppage end-endpage end-endfile before processing
+syn keyword naturalKeyword end-before
+
+" conditionals
+syn keyword naturalConditional if then else end-if end-norec
+syn keyword naturalConditional decide end-decide value when condition none any
+
+" assignment / calculation
+syn keyword naturalKeyword reset assign move left right justified compress to into edited
+syn keyword naturalKeyword add subtract multiply divide compute name
+syn keyword naturalKeyword all giving remainder rounded leaving space numeric
+syn keyword naturalKeyword examine full replace giving separate delimiter modified
+syn keyword naturalKeyword suspend identical suppress
+
+" program flow
+syn keyword naturalFlow callnat fetch return enter escape bottom top stack formatted
+syn keyword naturalFlow command call
+syn keyword naturalflow end-subroutine routine
+
+" file operations
+syn keyword naturalKeyword update store get delete end transaction work once close
+
+" other keywords
+syn keyword naturalKeyword first every of no record[s] found ignore immediate
+syn keyword naturalKeyword set settime key control stop terminate
+
+" in-/output
+syn keyword naturalKeyword write display input reinput notitle nohdr map newpage
+syn keyword naturalKeyword alarm text help eject index window base size
+syn keyword naturalKeyword format printer skip lines
+
+" functions
+syn keyword naturalKeyword abs atn cos exp frac int log sgn sin sqrt tan val old
+syn keyword naturalKeyword pos
+
+" report mode keywords
+syn keyword naturalRMKeyword same loop obtain indexed do doend
+
+" Subroutine name
+syn keyword naturalFlow perform subroutine nextgroup=naturalFunction skipwhite
+syn match naturalFunction "\<[a-z][-_a-z0-9]*\>"
+
+syn keyword naturalFlow using nextgroup=naturalKeyword,naturalObjName skipwhite
+syn match naturalObjName "\<[a-z][-_a-z0-9]\{,7}\>"
+
+" Labels
+syn match naturalLabel "\<[+#a-z][-_#a-z0-9]*\."
+syn match naturalRef "\<[+#a-z][-_#a-z0-9]*\>\.\<[+#a-z][*]\=[-_#a-z0-9]*\>"
+
+" mark keyword special handling
+syn keyword naturalKeyword mark nextgroup=naturalMark skipwhite
+syn match naturalMark "\<\*[a-z][-_#.a-z0-9]*\>"
+
+" System variables
+syn match naturalSysVar "\<\*[a-z][-a-z0-9]*\>"
+
+"integer number, or floating point number without a dot.
+syn match naturalNumber "\<-\=\d\+\>"
+"floating point number, with dot
+syn match naturalNumber "\<-\=\d\+\.\d\+\>"
+"floating point number, starting with a dot
+syn match naturalNumber "\.\d\+"
+
+" Formats in write statement
+syn match naturalFormat "\<\d\+[TX]\>"
+
+" String and Character contstants
+syn match naturalString "H'\x\+'"
+syn region naturalString start=+"+ end=+"+
+syn region naturalString start=+'+ end=+'+
+
+" Type definition
+syn match naturalAttribute "\<[-a-z][a-z]=[-a-z0-9_\.,]\+\>"
+syn match naturalType contained "\<[ABINP]\d\+\(,\d\+\)\=\>"
+syn match naturalType contained "\<[CL]\>"
+
+" "TODO" / other comments
+syn keyword naturalTodo contained todo test
+syn match naturalCommentMark contained "[a-z][^ \t/:|]*\(\s[^ \t/:'"|]\+\)*:\s"he=e-1
+
+" comments
+syn region naturalComment start="/\*" end="$" contains=naturalTodo,naturalLineRef,naturalCommentMark
+syn region naturalComment start="^\*[ *]" end="$" contains=naturalTodo,naturalLineRef,naturalCommentMark
+syn region naturalComment start="^\d\{4} \*[\ \*]"lc=5 end="$" contains=naturalTodo,naturalLineRef,naturalCommentMark
+syn match naturalComment "^\*$"
+syn match naturalComment "^\d\{4} \*$"lc=5
+" /* is legal syntax in parentheses e.g. "#ident(label./*)"
+syn region naturalPComment contained start="/\*\s*[^),]" end="$" contains=naturalTodo,naturalLineRef,naturalCommentMark
+
+" operators
+syn keyword naturalOperator and or not eq ne gt lt ge le mask scan modified
+
+" constants
+syn keyword naturalBoolean true false
+syn match naturalLineNo "^\d\{4}"
+
+" identifiers
+syn match naturalIdent "\<[+#a-z][-_#a-z0-9]*\>[^\.']"me=e-1
+syn match naturalIdent "\<[+#a-z][-_#a-z0-9]*$"
+syn match naturalLegalIdent "[+#a-z][-_#a-z0-9]*/[-_#a-z0-9]*"
+
+" parentheses
+syn region naturalPar matchgroup=naturalParGui start="(" end=")" contains=naturalLabel,naturalRef,naturalOperator,@naturalConstant,naturalType,naturalSysVar,naturalPar,naturalLineNo,naturalPComment
+syn match naturalLineRef "(\d\{4})"
+
+" build syntax groups
+syntax cluster naturalConstant contains=naturalString,naturalNumber,naturalAttribute,naturalBoolean
+
+" folding
+if v:version >= 600
+ set foldignore=*
+endif
+
+
+" The default methods for highlighting. Can be overridden later
+
+" Constants
+hi def link naturalFormat Constant
+hi def link naturalAttribute Constant
+hi def link naturalNumber Number
+hi def link naturalString String
+hi def link naturalBoolean Boolean
+
+" All kinds of keywords
+hi def link naturalConditional Conditional
+hi def link naturalRepeat Repeat
+hi def link naturalLoop Repeat
+hi def link naturalFlow Keyword
+hi def link naturalError Keyword
+hi def link naturalKeyword Keyword
+hi def link naturalOperator Operator
+hi def link naturalParGui Operator
+
+" Labels
+hi def link naturalLabel Label
+hi def link naturalRefLabel Label
+
+" Comments
+hi def link naturalPComment Comment
+hi def link naturalComment Comment
+hi def link naturalTodo Todo
+hi def link naturalCommentMark PreProc
+
+hi def link naturalInclude Include
+hi def link naturalSysVar Identifier
+hi def link naturalLineNo LineNr
+hi def link naturalLineRef Error
+hi def link naturalSpecial Special
+hi def link naturalComKey Todo
+
+" illegal things
+hi def link naturalRMKeyword Error
+hi def link naturalLegalIdent Error
+
+hi def link naturalType Type
+hi def link naturalFunction Function
+hi def link naturalObjName PreProc
+
+
+let b:current_syntax = "natural"
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim:set ts=8 sw=8 noet ft=vim list: